A luminescent and biocompatible photoCORM

Area of Science:

• Inorganic Chemistry
• Photochemistry
• Cell Biology

Background:

• Rhenium(I) complexes are explored for their luminescent and photoactive properties.
• Carbon monoxide-releasing molecules (CORMs) have therapeutic potential.
• Developing photoactivated CORMs (photoCORMs) allows for spatiotemporal control of CO release.

Purpose of the Study:

• To synthesize and characterize a water-soluble rhenium(I) complex, fac-[Re(bpy)(3)(CO)(3)(thp)]+, as a photoCORM.
• To evaluate its photophysical properties, stability, cellular uptake, and cytotoxicity.
• To demonstrate its utility in tracking CO release within cancer cells.

Main Methods:

• Synthesis and characterization of the rhenium(I) complex.
• Photophysical measurements (luminescence).
• Cellular uptake studies using PPC-1 cells.
• Confocal fluorescence microscopy to visualize intracellular CO release.

Main Results:

• The complex fac-[Re(bpy)(3)(CO)(3)(thp)](+) is strongly luminescent and photoactive, releasing CO upon irradiation.
• It is stable in aqueous media, taken up by PPC-1 cells, and exhibits no cytotoxicity.
• The luminescent photoproduct allows for real-time tracking of CO release within cells.

Conclusions:

• The rhenium(I) complex is a promising photoCORM with potential therapeutic applications.
• Its ability to release CO in a controlled manner and be visualized intracellularly is demonstrated.
• This work highlights the potential of luminescent rhenium complexes in photopharmacology.